EP 0467870 A1 19920122 - Roller tooth bit with heel row cutter inserts.
Title (en)
Roller tooth bit with heel row cutter inserts.
Title (de)
Zahnrollenmeissel mit Umfangsschneideinsätzen.
Title (fr)
Trépan à molettes dentées avec éléments de coupe rapportés périphériques.
Publication
Application
Priority
US 55060690 A 19900710
Abstract (en)
A milled tooth rotary cone rock bit, as it is operated in a borehole, brings the heel of each cone into contact with the borehole wall when the gage row milled teeth wear. The heel row of each cone is relieved and tungsten carbide chisel inserts (134) are equidistantly placed within the relieved heel recess. The heel row inserts cooperate with the gage row milled teeth (129) and progressively cut more of the gage of the borehole as the row of milled teeth on the gage of the cone wear. Moreover, the gage row milled teeth are partially hardfaced leaving relieved areas on the cutting side of each tooth to enhance the cutting action of the gage row of each cone. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/16 (2006.01); E21B 10/50 (2006.01)
CPC (source: EP US)
E21B 10/16 (2013.01 - EP US); E21B 10/50 (2013.01 - EP US)
Citation (search report)
- [A] DE 1046544 B 19581218 - HUGHES TOOL CO
- [A] US 3696876 A 19721010 - OTT EUGENE G
- [AD] US 4836307 A 19890606 - KESHAVAN MADAPUSI K [US], et al
Designated contracting state (EPC)
AT DE FR GB IT SE
DOCDB simple family (publication)
EP 0467870 A1 19920122; EP 0467870 B1 19950125; AT E117764 T1 19950215; DE 69106964 D1 19950309; MX 9100112 A 19920228; NO 912656 D0 19910708; NO 912656 L 19920113; US 5131480 A 19920721
DOCDB simple family (application)
EP 91850174 A 19910624; AT 91850174 T 19910624; DE 69106964 T 19910624; MX 9100112 A 19910708; NO 912656 A 19910708; US 73764091 A 19910730